From patchwork Wed Oct 9 19:25:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 11182015 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CC21D13BD for ; Wed, 9 Oct 2019 19:26:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B5C09206B6 for ; Wed, 9 Oct 2019 19:26:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731914AbfJITZl (ORCPT ); Wed, 9 Oct 2019 15:25:41 -0400 Received: from ale.deltatee.com ([207.54.116.67]:37620 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731850AbfJITZl (ORCPT ); Wed, 9 Oct 2019 15:25:41 -0400 Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1iIHaa-0002g7-6l; Wed, 09 Oct 2019 13:25:39 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1iIHaY-0003QD-Ns; Wed, 09 Oct 2019 13:25:34 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: Christoph Hellwig , Sagi Grimberg , Keith Busch , Jens Axboe , Chaitanya Kulkarni , Max Gurtovoy , Stephen Bates , Logan Gunthorpe , Chaitanya Kulkarni Date: Wed, 9 Oct 2019 13:25:24 -0600 Message-Id: <20191009192530.13079-8-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191009192530.13079-1-logang@deltatee.com> References: <20191009192530.13079-1-logang@deltatee.com> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, hch@lst.de, sagi@grimberg.me, kbusch@kernel.org, axboe@fb.com, maxg@mellanox.com, sbates@raithlin.com, logang@deltatee.com, Chaitanya.Kulkarni@wdc.com, chaitanya.kulkarni@wdc.com X-SA-Exim-Mail-From: gunthorp@deltatee.com X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on ale.deltatee.com X-Spam-Level: X-Spam-Status: No, score=-8.5 required=5.0 tests=ALL_TRUSTED,BAYES_00, GREYLIST_ISWHITE,MYRULES_FREE,MYRULES_NO_TEXT autolearn=ham autolearn_force=no version=3.4.2 Subject: [PATCH v9 06/12] nvmet-passthru: add enable/disable helpers X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This patch adds helper functions which are used in the NVMeOF configfs when the user is configuring the passthru subsystem. Here we ensure that only one subsys is assigned to each nvme_ctrl by using an xarray on the cntlid. [chaitanya.kulkarni@wdc.com: this patch is very roughly based on a similar one by Chaitanya] Signed-off-by: Chaitanya Kulkarni Signed-off-by: Logan Gunthorpe --- drivers/nvme/target/core.c | 8 +++ drivers/nvme/target/io-cmd-passthru.c | 77 +++++++++++++++++++++++++++ drivers/nvme/target/nvmet.h | 10 ++++ 3 files changed, 95 insertions(+) diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 256f765e772b..986b2511d284 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -520,6 +520,12 @@ int nvmet_ns_enable(struct nvmet_ns *ns) mutex_lock(&subsys->lock); ret = 0; + + if (nvmet_passthru_ctrl(subsys)) { + pr_info("cannot enable both passthru and regular namespaces for a single subsystem"); + goto out_unlock; + } + if (ns->enabled) goto out_unlock; @@ -1440,6 +1446,8 @@ static void nvmet_subsys_free(struct kref *ref) WARN_ON_ONCE(!list_empty(&subsys->namespaces)); + nvmet_passthru_subsys_free(subsys); + kfree(subsys->subsysnqn); kfree(subsys); } diff --git a/drivers/nvme/target/io-cmd-passthru.c b/drivers/nvme/target/io-cmd-passthru.c index 1eb855b4071c..c482e55f0fb8 100644 --- a/drivers/nvme/target/io-cmd-passthru.c +++ b/drivers/nvme/target/io-cmd-passthru.c @@ -11,6 +11,11 @@ #include "../host/nvme.h" #include "nvmet.h" +/* + * xarray to maintain one passthru subsystem per nvme controller. + */ +static DEFINE_XARRAY(passthru_subsystems); + static struct workqueue_struct *passthru_wq; int nvmet_passthru_init(void) @@ -27,6 +32,78 @@ void nvmet_passthru_destroy(void) destroy_workqueue(passthru_wq); } +int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys) +{ + struct nvme_ctrl *ctrl; + int ret = -EINVAL; + void *old; + + mutex_lock(&subsys->lock); + if (!subsys->passthru_ctrl_path) + goto out_unlock; + if (subsys->passthru_ctrl) + goto out_unlock; + + if (subsys->nr_namespaces) { + pr_info("cannot enable both passthru and regular namespaces for a single subsystem"); + goto out_unlock; + } + + ctrl = nvme_ctrl_get_by_path(subsys->passthru_ctrl_path); + if (IS_ERR(ctrl)) { + ret = PTR_ERR(ctrl); + pr_err("failed to open nvme controller %s\n", + subsys->passthru_ctrl_path); + + goto out_unlock; + } + + old = xa_cmpxchg(&passthru_subsystems, ctrl->cntlid, NULL, + subsys, GFP_KERNEL); + if (xa_is_err(old)) { + ret = xa_err(old); + goto out_put_ctrl; + } + + if (old) + goto out_put_ctrl; + + subsys->passthru_ctrl = ctrl; + + mutex_unlock(&subsys->lock); + return 0; + +out_put_ctrl: + nvme_put_ctrl(ctrl); +out_unlock: + mutex_unlock(&subsys->lock); + return ret; +} + +static void __nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys) +{ + if (subsys->passthru_ctrl) { + xa_erase(&passthru_subsystems, subsys->passthru_ctrl->cntlid); + nvme_put_ctrl(subsys->passthru_ctrl); + } + subsys->passthru_ctrl = NULL; +} + +void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys) +{ + mutex_lock(&subsys->lock); + __nvmet_passthru_ctrl_disable(subsys); + mutex_unlock(&subsys->lock); +} + +void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys) +{ + mutex_lock(&subsys->lock); + __nvmet_passthru_ctrl_disable(subsys); + kfree(subsys->passthru_ctrl_path); + mutex_unlock(&subsys->lock); +} + static void nvmet_passthru_req_complete(struct nvmet_req *req, struct request *rq, u16 status) { diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index daec1240307c..2c287d13ed83 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -230,6 +230,7 @@ struct nvmet_subsys { #ifdef CONFIG_NVME_TARGET_PASSTHRU struct nvme_ctrl *passthru_ctrl; + char *passthru_ctrl_path; #endif /* CONFIG_NVME_TARGET_PASSTHRU */ }; @@ -509,6 +510,9 @@ static inline u32 nvmet_rw_len(struct nvmet_req *req) int nvmet_passthru_init(void); void nvmet_passthru_destroy(void); +void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys); +int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys); +void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys); u16 nvmet_parse_passthru_cmd(struct nvmet_req *req); static inline @@ -526,6 +530,12 @@ static inline int nvmet_passthru_init(void) static inline void nvmet_passthru_destroy(void) { } +static inline void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys) +{ +} +static inline void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys) +{ +} static inline u16 nvmet_parse_passthru_cmd(struct nvmet_req *req) { return 0;